/usr/src/xtables-addons-1.40/xt_length2.Kconfig is in xtables-addons-dkms 1.40-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | config NETFILTER_XT_MATCH_LENGTH2
tristate '"length2" match support'
depends on NETFILTER_XTABLES
---help---
This option adds the "length2" match which is an advanced form of
xt_length that allows unambiguous layer-4/-5/-7 length matching. It is
useful to detect empty packets or for aiding in packet scheduling.
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